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Penn Jillette of Penn and Teller fame has patented a "Hydro-Therapeutic Stimulator", which uses a hot tub for stimulation.
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| Number | Title | Issue Date |
| D589514 | Electronic stylus | 03/31/2009 |
| D584313 | Electronic stylus holder | 01/06/2009 |
| 7268774 | Tracking motion of a writing instrument Motion of a writing instrument is tracked from sensors located in the vicinity. The signals generated from the sensors are processed and used in a wide variety of ways. ... | 09/11/2007 |
| 7257255 | Capturing hand motion A portable electronic device, a digital camera associated with the portable electronic device, and software configured to run on the portable electronic device and to derive handwriting and control information from hand motion of a writing instrument in the vicinity... | 08/14/2007 |
